Does parenting style affect emotion regulation among children who initially demonstrate high levels of fear and anxiety? Although recent correlational research has demonstrated a linkage between parental behaviors, such as excessive intrusiveness, and children's manifestations of fear and anxiety, it is not clear if parenting behaviors directly influence children's ability to regulate these emotions. Alternatively, these parental behaviors may be elicited by children who express fears and anxieties more frequently than other children do. Experimental research designs would offer a more definitive test of these competing explanations of the extant correlational findings. Intervention studies, in particular, can test whether experimentally manipulating current family interaction patterns affects children's ability to regulate emotion. This study provides a preliminary experimental test of the relationship between parental behavior and children's regulation of fear and anxiety. Some 40 clinically anxious youth, aged 6-13, were randomly assigned to a family intervention program for childhood anxiety problems, which includes extensive parent communication training, or a child intervention program without parent-training. By comparing these two interventions, we tested if it was possible to improve parenting behaviors—such as intrusiveness—through intensive parent-training, above and beyond the effects of involving children in a child intervention program. We then tested the impact of this change in parental behaviors on children's ability to regulate fear and anxiety. We hypothesized that parent-training would reduce intrusiveness, which would in turn improve children's anxiety outcomes.